Add check on force_local in custom_command CI handling

The force_local flag was introduced earlier in the main CI script in order to run a CI test locally.

The flag was still missing in the Custom_Command handling, which was still targeting the node specified in the test configuration file. This was causing a failure in the tests with custom commands and therefore limiting the scenarios that could be run locally.

With this commit, if force_local is enabled the node for the Custom_Command is set to localhost.